2 * Copyright (c) 1988, 1989, 1990, 1993
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 1989 by Berkeley Softworks
7 * This code is derived from software contributed to Berkeley by
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 * must display the following acknowledgement:
20 * This product includes software developed by the University of
21 * California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 * may be used to endorse or promote products derived from this software
24 * without specific prior written permission.
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * @(#)main.c 8.3 (Berkeley) 3/19/94
43 static char copyright[] =
44 "@(#) Copyright (c) 1988, 1989, 1990, 1993\n\
45 The Regents of the University of California. All rights reserved.\n";
48 #include <sys/cdefs.h>
49 __FBSDID("$FreeBSD$");
53 * The main file for this entire program. Exit routines etc
56 * Utility functions defined in this file:
57 * Main_ParseArgLine Takes a line of arguments, breaks them and
58 * treats them as if they were given when first
59 * invoked. Used by the parse module to implement
63 #include <sys/param.h>
64 #include <sys/signal.h>
67 #include <sys/sysctl.h>
70 #include <sys/resource.h>
72 #include <sys/utsname.h>
90 #include "pathnames.h"
92 #define WANT_ENV_MKLVL 1
95 #define DEFMAXLOCAL DEFMAXJOBS
96 #endif /* DEFMAXLOCAL */
98 #define MAKEFLAGS ".MAKEFLAGS"
100 Lst create; /* Targets to be made */
101 time_t now; /* Time at start of make */
102 GNode *DEFAULT; /* .DEFAULT node */
103 Boolean allPrecious; /* .PRECIOUS given on line by itself */
105 static Boolean noBuiltins; /* -r flag */
106 static Lst makefiles; /* ordered list of makefiles to read */
107 static Boolean expandVars; /* fully expand printed variables */
108 static Lst variables; /* list of variables to print */
109 int maxJobs; /* -j argument */
110 static Boolean forceJobs; /* -j argument given */
111 static int maxLocal; /* -L argument */
112 Boolean compatMake; /* -B argument */
113 Boolean debug; /* -d flag */
114 Boolean noExecute; /* -n flag */
115 Boolean keepgoing; /* -k flag */
116 Boolean queryFlag; /* -q flag */
117 Boolean touchFlag; /* -t flag */
118 Boolean usePipes; /* !-P flag */
119 Boolean ignoreErrors; /* -i flag */
120 Boolean beSilent; /* -s flag */
121 Boolean beVerbose; /* -v flag */
122 Boolean oldVars; /* variable substitution style */
123 Boolean checkEnvFirst; /* -e flag */
124 Lst envFirstVars; /* (-E) vars to override from env */
125 Boolean jobsRunning; /* TRUE if the jobs might be running */
127 static void MainParseArgs(int, char **);
128 char * chdir_verify_path(char *, char *);
129 static int ReadMakefile(void *, void *);
130 static void usage(void);
132 static char *curdir; /* startup directory */
133 static char *objdir; /* where we chdir'ed to */
136 * Append a flag with an optional argument to MAKEFLAGS and MFLAGS
139 MFLAGS_append(char *flag, char *arg)
141 Var_Append(MAKEFLAGS, flag, VAR_GLOBAL);
143 Var_Append(MAKEFLAGS, arg, VAR_GLOBAL);
145 Var_Append("MFLAGS", flag, VAR_GLOBAL);
147 Var_Append("MFLAGS", arg, VAR_GLOBAL);
152 * Parse a given argument vector. Called from main() and from
153 * Main_ParseArgLine() when the .MAKEFLAGS target is used.
155 * XXX: Deal with command line overriding .MAKEFLAGS in makefile
161 * Various global and local flags will be set depending on the flags
165 MainParseArgs(int argc, char **argv)
170 optind = 1; /* since we're called more than once */
172 # define OPTFLAGS "BC:D:E:I:L:PSV:Xd:ef:ij:km:nqrstv"
174 # define OPTFLAGS "BC:D:E:I:PSV:Xd:ef:ij:km:nqrstv"
176 rearg: while((c = getopt(argc, argv, OPTFLAGS)) != -1) {
179 if (chdir(optarg) == -1)
180 err(1, "chdir %s", optarg);
183 Var_Set(optarg, "1", VAR_GLOBAL);
184 MFLAGS_append("-D", optarg);
187 Parse_AddIncludeDir(optarg);
188 MFLAGS_append("-I", optarg);
191 (void)Lst_AtEnd(variables, (void *)optarg);
192 MFLAGS_append("-V", optarg);
199 MFLAGS_append("-B", NULL);
205 maxLocal = strtol(optarg, &endptr, 10);
206 if (maxLocal < 0 || *endptr != '\0') {
207 warnx("illegal number, -L argument -- %s",
211 MFLAGS_append("-L", optarg);
217 MFLAGS_append("-P", NULL);
221 MFLAGS_append("-S", NULL);
224 char *modules = optarg;
226 for (; *modules; ++modules)
244 if (modules[1] == '1') {
245 debug |= DEBUG_GRAPH1;
248 else if (modules[1] == '2') {
249 debug |= DEBUG_GRAPH2;
272 warnx("illegal argument to d option -- %c", *modules);
275 MFLAGS_append("-d", optarg);
279 p = emalloc(strlen(optarg) + 1);
280 (void)strcpy(p, optarg);
281 (void)Lst_AtEnd(envFirstVars, (void *)p);
282 MFLAGS_append("-E", optarg);
285 checkEnvFirst = TRUE;
286 MFLAGS_append("-e", NULL);
289 (void)Lst_AtEnd(makefiles, (void *)optarg);
293 MFLAGS_append("-i", NULL);
299 maxJobs = strtol(optarg, &endptr, 10);
300 if (maxJobs <= 0 || *endptr != '\0') {
301 warnx("illegal number, -j argument -- %s",
308 MFLAGS_append("-j", optarg);
313 MFLAGS_append("-k", NULL);
316 Dir_AddDir(sysIncPath, optarg);
317 MFLAGS_append("-m", optarg);
321 MFLAGS_append("-n", NULL);
325 /* Kind of nonsensical, wot? */
326 MFLAGS_append("-q", NULL);
330 MFLAGS_append("-r", NULL);
334 MFLAGS_append("-s", NULL);
338 MFLAGS_append("-t", NULL);
342 MFLAGS_append("-v", NULL);
353 * See if the rest of the arguments are variable assignments and
354 * perform them if so. Else take them to be targets and stuff them
355 * on the end of the "create" list.
357 for (argv += optind, argc -= optind; *argv; ++argv, --argc)
358 if (Parse_IsVar(*argv)) {
359 char *ptr = Var_Quote(*argv);
361 Var_Append(MAKEFLAGS, ptr, VAR_GLOBAL);
364 Parse_DoVar(*argv, VAR_CMD);
367 Punt("illegal (null) argument.");
370 optind = 0; /* -flag... */
375 (void)Lst_AtEnd(create, (void *)estrdup(*argv));
380 * Main_ParseArgLine --
381 * Used by the parse module when a .MFLAGS or .MAKEFLAGS target
382 * is encountered and by main() when reading the .MAKEFLAGS envariable.
383 * Takes a line of arguments and breaks it into its
384 * component words and passes those words and the number of them to the
385 * MainParseArgs function.
386 * The line should have all its leading whitespace removed.
392 * Only those that come from the various arguments.
395 Main_ParseArgLine(char *line)
397 char **argv; /* Manufactured argument vector */
398 int argc; /* Number of arguments in argv */
402 for (; *line == ' '; ++line)
407 argv = brk_string(line, &argc, TRUE);
408 MainParseArgs(argc, argv);
412 chdir_verify_path(char *path, char *obpath)
416 if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode)) {
417 if (chdir(path) == -1 || getcwd(obpath, MAXPATHLEN) == NULL) {
418 warn("warning: %s", path);
428 catch_child(int sig __unused)
434 * The main function, for obvious reasons. Initializes variables
435 * and a few modules, then parses the arguments give it in the
436 * environment and on the command line. Reads the system makefile
437 * followed by either Makefile, makefile or the file given by the
438 * -f argument. Sets the .MAKEFLAGS PMake variable based on all the
439 * flags it has received by then uses either the Make or the Compat
440 * module to create the initial list of targets.
443 * If -q was given, exits -1 if anything was out-of-date. Else it exits
447 * The program exits when done. Targets are created. etc. etc. etc.
450 main(int argc, char **argv)
452 Lst targs; /* target nodes to create -- passed to Make_Init */
453 Boolean outOfDate = TRUE; /* FALSE if all targets up to date */
455 char *p, *p1, *path, *pathp;
456 #ifdef WANT_ENV_MKLVL
457 #define MKLVL_MAXVAL 500
458 #define MKLVL_ENVVAR "__MKLVL__"
460 char *szMkLvl = getenv(MKLVL_ENVVAR);
461 #endif /* WANT_ENV_MKLVL */
462 char mdpath[MAXPATHLEN];
463 char obpath[MAXPATHLEN];
464 char cdpath[MAXPATHLEN];
465 char *machine = getenv("MACHINE");
466 char *machine_arch = getenv("MACHINE_ARCH");
467 char *machine_cpu = getenv("MACHINE_CPU");
468 Lst sysMkPath; /* Path of sys.mk */
469 char *cp = NULL, *start;
470 /* avoid faults on read-only strings */
471 static char syspath[] = _PATH_DEFSYSPATH;
475 * Catch SIGCHLD so that we get kicked out of select() when we
476 * need to look at a child. This is only known to matter for the
477 * -j case (perhaps without -P).
479 * XXX this is intentionally misplaced.
483 sigemptyset(&sa.sa_mask);
484 sa.sa_flags = SA_RESTART | SA_NOCLDSTOP;
485 sa.sa_handler = catch_child;
486 sigaction(SIGCHLD, &sa, NULL);
489 #ifdef WANT_ENV_MKLVL
490 if ((iMkLvl = szMkLvl ? atoi(szMkLvl) : 0) < 0) {
493 if (iMkLvl++ > MKLVL_MAXVAL) {
495 "Max recursion level (%d) exceeded.", MKLVL_MAXVAL);
497 bzero(szMkLvl = emalloc(32), 32);
498 sprintf(szMkLvl, "%d", iMkLvl);
499 setenv(MKLVL_ENVVAR, szMkLvl, 1);
500 #endif /* WANT_ENV_MKLVL */
504 * Turn off ENV to make ksh happier.
511 * get rid of resource limit on file descriptors
515 if (getrlimit(RLIMIT_NOFILE, &rl) != -1 &&
516 rl.rlim_cur != rl.rlim_max) {
517 rl.rlim_cur = rl.rlim_max;
518 (void) setrlimit(RLIMIT_NOFILE, &rl);
524 * PC-98 kernel sets the `i386' string to the utsname.machine and
525 * it cannot be distinguished from IBM-PC by uname(3). Therefore,
526 * we check machine.ispc98 and adjust the machine variable before
527 * using usname(3) below.
528 * NOTE: machdep.ispc98 was defined on 1998/8/31. At that time,
529 * __FreeBSD_version was defined as 300003. So, this check can
530 * safely be done with any kernel with version > 300003.
536 len = sizeof(ispc98);
537 if (!sysctlbyname("machdep.ispc98", &ispc98, &len, NULL, 0)) {
544 * Get the name of this type of MACHINE from utsname
545 * so we can share an executable for similar machines.
546 * (i.e. m68k: amiga hp300, mac68k, sun3, ...)
548 * Note that while MACHINE is decided at run-time,
549 * MACHINE_ARCH is always known at compile time.
553 struct utsname utsname;
555 if (uname(&utsname) == -1)
557 machine = utsname.machine;
565 machine_arch = "unknown";
567 machine_arch = MACHINE_ARCH;
572 * Set machine_cpu to the minumum supported CPU revision based
573 * on the target architecture, if not already set.
576 if (!strcmp(machine_arch, "i386"))
577 machine_cpu = "i386";
578 else if (!strcmp(machine_arch, "alpha"))
581 machine_cpu = "unknown";
584 create = Lst_Init(FALSE);
585 makefiles = Lst_Init(FALSE);
586 envFirstVars = Lst_Init(FALSE);
588 variables = Lst_Init(FALSE);
589 beSilent = FALSE; /* Print commands as executed */
590 ignoreErrors = FALSE; /* Pay attention to non-zero returns */
591 noExecute = FALSE; /* Execute all commands */
592 keepgoing = FALSE; /* Stop on error */
593 allPrecious = FALSE; /* Remove targets when interrupted */
594 queryFlag = FALSE; /* This is not just a check-run */
595 noBuiltins = FALSE; /* Read the built-in rules */
596 touchFlag = FALSE; /* Actually update targets */
597 usePipes = TRUE; /* Catch child output in pipes */
598 debug = 0; /* No debug verbosity, please. */
601 maxLocal = DEFMAXLOCAL; /* Set default local max concurrency */
603 maxJobs = DEFMAXJOBS; /* Set default max concurrency */
607 forceJobs = FALSE; /* No -j flag */
608 compatMake = FALSE; /* No compat mode */
612 * Initialize the parsing, directory and variable modules to prepare
613 * for the reading of inclusion paths and variable settings on the
616 Dir_Init(); /* Initialize directory structures so -I flags
617 * can be processed correctly */
618 Parse_Init(); /* Need to initialize the paths of #include
620 Var_Init(); /* As well as the lists of variables for
621 * parsing arguments */
625 * Initialize various variables.
626 * MAKE also gets this name, for compatibility
627 * .MAKEFLAGS gets set to the empty string just in case.
628 * MFLAGS also gets initialized empty, for compatibility.
630 Var_Set("MAKE", argv[0], VAR_GLOBAL);
631 Var_Set(MAKEFLAGS, "", VAR_GLOBAL);
632 Var_Set("MFLAGS", "", VAR_GLOBAL);
633 Var_Set("MACHINE", machine, VAR_GLOBAL);
634 Var_Set("MACHINE_ARCH", machine_arch, VAR_GLOBAL);
635 Var_Set("MACHINE_CPU", machine_cpu, VAR_GLOBAL);
637 Var_Set("MAKE_VERSION", MAKE_VERSION, VAR_GLOBAL);
641 * First snag any flags out of the MAKE environment variable.
642 * (Note this is *not* MAKEFLAGS since /bin/make uses that and it's
643 * in a different format).
646 Main_ParseArgLine(getenv("MAKEFLAGS"));
648 Main_ParseArgLine(getenv("MAKE"));
651 MainParseArgs(argc, argv);
654 * Find where we are...
655 * All this code is so that we know where we are when we start up
656 * on a different machine with pmake.
659 if (getcwd(curdir, MAXPATHLEN) == NULL)
662 if (stat(curdir, &sa) == -1)
663 err(2, "%s", curdir);
666 * The object directory location is determined using the
667 * following order of preference:
669 * 1. MAKEOBJDIRPREFIX`cwd`
671 * 3. _PATH_OBJDIR.${MACHINE}
673 * 5. _PATH_OBJDIRPREFIX`cwd`
675 * If one of the first two fails, use the current directory.
676 * If the remaining three all fail, use the current directory.
678 * Once things are initted,
679 * have to add the original directory to the search path,
680 * and modify the paths for the Makefiles apropriately. The
681 * current directory is also placed as a variable for make scripts.
683 if (!(pathp = getenv("MAKEOBJDIRPREFIX"))) {
684 if (!(path = getenv("MAKEOBJDIR"))) {
686 pathp = _PATH_OBJDIRPREFIX;
687 (void) snprintf(mdpath, MAXPATHLEN, "%s.%s",
689 if (!(objdir = chdir_verify_path(mdpath, obpath)))
690 if (!(objdir=chdir_verify_path(path, obpath))) {
691 (void) snprintf(mdpath, MAXPATHLEN,
692 "%s%s", pathp, curdir);
693 if (!(objdir=chdir_verify_path(mdpath,
698 else if (!(objdir = chdir_verify_path(path, obpath)))
702 (void) snprintf(mdpath, MAXPATHLEN, "%s%s", pathp, curdir);
703 if (!(objdir = chdir_verify_path(mdpath, obpath)))
706 Dir_InitDot(); /* Initialize the "." directory */
707 if (objdir != curdir)
708 Dir_AddDir(dirSearchPath, curdir);
709 Var_Set(".CURDIR", curdir, VAR_GLOBAL);
710 Var_Set(".OBJDIR", objdir, VAR_GLOBAL);
713 * Be compatible if user did not specify -j and did not explicitly
714 * turned compatibility on
716 if (!compatMake && !forceJobs)
720 * Initialize archive, target and suffix modules in preparation for
721 * parsing the makefile(s)
731 * Set up the .TARGETS variable to contain the list of targets to be
732 * created. If none specified, make the variable empty -- the parser
733 * will fill the thing in with the default or .MAIN target.
735 if (!Lst_IsEmpty(create)) {
738 for (ln = Lst_First(create); ln != NULL;
740 char *name = (char *)Lst_Datum(ln);
742 Var_Append(".TARGETS", name, VAR_GLOBAL);
745 Var_Set(".TARGETS", "", VAR_GLOBAL);
749 * If no user-supplied system path was given (through the -m option)
750 * add the directories from the DEFSYSPATH (more than one may be given
751 * as dir1:...:dirn) to the system include path.
753 if (Lst_IsEmpty(sysIncPath)) {
754 for (start = syspath; *start != '\0'; start = cp) {
755 for (cp = start; *cp != '\0' && *cp != ':'; cp++)
758 Dir_AddDir(sysIncPath, start);
761 Dir_AddDir(sysIncPath, start);
767 * Read in the built-in rules first, followed by the specified
768 * makefile, if it was (makefile != (char *) NULL), or the default
769 * Makefile and makefile, in that order, if it wasn't.
774 sysMkPath = Lst_Init (FALSE);
775 Dir_Expand (_PATH_DEFSYSMK, sysIncPath, sysMkPath);
776 if (Lst_IsEmpty(sysMkPath))
777 Fatal("make: no system rules (%s).", _PATH_DEFSYSMK);
778 ln = Lst_Find(sysMkPath, (void *)NULL, ReadMakefile);
780 Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
783 if (!Lst_IsEmpty(makefiles)) {
786 ln = Lst_Find(makefiles, (void *)NULL, ReadMakefile);
788 Fatal("make: cannot open %s.", (char *)Lst_Datum(ln));
789 } else if (!ReadMakefile("BSDmakefile", NULL))
790 if (!ReadMakefile("makefile", NULL))
791 (void)ReadMakefile("Makefile", NULL);
793 (void)ReadMakefile(".depend", NULL);
795 /* Install all the flags into the MAKE envariable. */
796 if (((p = Var_Value(MAKEFLAGS, VAR_GLOBAL, &p1)) != NULL) && *p)
798 setenv("MAKEFLAGS", p, 1);
800 setenv("MAKE", p, 1);
805 * For compatibility, look at the directories in the VPATH variable
806 * and add them to the search path, if the variable is defined. The
807 * variable's value is in the same format as the PATH envariable, i.e.
808 * <directory>:<directory>:<directory>...
810 if (Var_Exists("VPATH", VAR_CMD)) {
813 * GCC stores string constants in read-only memory, but
814 * Var_Subst will want to write this thing, so store it
817 static char VPATH[] = "${VPATH}";
819 vpath = Var_Subst(NULL, VPATH, VAR_CMD, FALSE);
822 /* skip to end of directory */
823 for (cp = path; *cp != ':' && *cp != '\0'; cp++)
825 /* Save terminator character so know when to stop */
828 /* Add directory to search path */
829 Dir_AddDir(dirSearchPath, path);
832 } while (savec == ':');
837 * Now that all search paths have been read for suffixes et al, it's
838 * time to add the default search path to their lists...
842 /* print the initial graph, if the user requested it */
846 /* print the values of any variables requested by the user */
847 if (!Lst_IsEmpty(variables)) {
850 for (ln = Lst_First(variables); ln != NULL;
854 p1 = emalloc(strlen((char *)Lst_Datum(ln)) + 1 + 3);
855 /* This sprintf is safe, because of the malloc above */
856 (void)sprintf(p1, "${%s}", (char *)Lst_Datum(ln));
857 value = Var_Subst(NULL, p1, VAR_GLOBAL, FALSE);
859 value = Var_Value((char *)Lst_Datum(ln),
862 printf("%s\n", value ? value : "");
869 * Have now read the entire graph and need to make a list of targets
870 * to create. If none was given on the command line, we consult the
871 * parsing module to find the main target(s) to create.
873 if (Lst_IsEmpty(create))
874 targs = Parse_MainName();
876 targs = Targ_FindList(create, TARG_CREATE);
880 * Initialize job module before traversing the graph, now that
881 * any .BEGIN and .END targets have been read. This is done
882 * only if the -q flag wasn't given (to prevent the .BEGIN from
883 * being executed should it exist).
888 Job_Init(maxJobs, maxLocal);
892 /* Traverse the graph, checking on all the targets */
893 outOfDate = Make_Run(targs);
896 * Compat_Init will take care of creating all the targets as
897 * well as initializing the module.
902 Lst_Destroy(targs, NOFREE);
905 Lst_Destroy(variables, NOFREE);
906 Lst_Destroy(makefiles, NOFREE);
907 Lst_Destroy(create, (void (*)(void *)) free);
909 /* print the graph now it's been processed if the user requested it */
921 if (queryFlag && outOfDate)
929 * Open and parse the given makefile.
932 * TRUE if ok. FALSE if couldn't open file.
938 ReadMakefile(void *p, void *q __unused)
940 char *fname; /* makefile to read */
942 char *name, path[MAXPATHLEN];
948 if (!strcmp(fname, "-")) {
949 Parse_File("(stdin)", stdin);
950 Var_Set("MAKEFILE", "", VAR_GLOBAL);
952 setMAKEFILE = strcmp(fname, ".depend");
954 /* if we've chdir'd, rebuild the path name */
955 if (curdir != objdir && *fname != '/') {
956 (void)snprintf(path, MAXPATHLEN, "%s/%s", curdir, fname);
958 * XXX The realpath stuff breaks relative includes
959 * XXX in some cases. The problem likely is in
960 * XXX parse.c where it does special things in
961 * XXX ParseDoInclude if the file is relateive
962 * XXX or absolute and not a system file. There
963 * XXX it assumes that if the current file that's
964 * XXX being included is absolute, that any files
965 * XXX that it includes shouldn't do the -I path
966 * XXX stuff, which is inconsistant with historical
967 * XXX behavior. However, I can't pentrate the mists
968 * XXX further, so I'm putting this workaround in
969 * XXX here until such time as the underlying bug
972 #if THIS_BREAKS_THINGS
973 if (realpath(path, path) != NULL &&
974 (stream = fopen(path, "r")) != NULL) {
979 } else if (realpath(fname, path) != NULL) {
982 if ((stream = fopen(fname, "r")) != NULL)
986 if ((stream = fopen(path, "r")) != NULL) {
993 if ((stream = fopen(fname, "r")) != NULL)
997 /* look in -I and system include directories. */
998 name = Dir_FindFile(fname, parseIncPath);
1000 name = Dir_FindFile(fname, sysIncPath);
1001 if (!name || !(stream = fopen(name, "r")))
1003 MAKEFILE = fname = name;
1005 * set the MAKEFILE variable desired by System V fans -- the
1006 * placement of the setting here means it gets set to the last
1007 * makefile specified, as it is set by SysV make.
1011 Var_Set("MAKEFILE", MAKEFILE, VAR_GLOBAL);
1012 Parse_File(fname, stream);
1013 (void)fclose(stream);
1020 * Execute the command in cmd, and return the output of that command
1024 * A string containing the output of the command, or the empty string
1025 * If error is not NULL, it contains the reason for the command failure
1028 * The string must be freed by the caller.
1031 Cmd_Exec(char *cmd, char **error)
1033 char *args[4]; /* Args for invoking the shell */
1034 int fds[2]; /* Pipe streams */
1035 int cpid; /* Child PID */
1036 int pid; /* PID from wait() */
1037 char *res; /* result */
1038 int status; /* command exit status */
1039 Buffer buf; /* buffer to store the result */
1046 * Set up arguments for shell
1054 * Open a pipe for fetching its output
1056 if (pipe(fds) == -1) {
1057 *error = "Couldn't create pipe for \"%s\"";
1064 switch (cpid = vfork()) {
1067 * Close input side of pipe
1069 (void) close(fds[0]);
1072 * Duplicate the output stream to the shell's output, then
1073 * shut the extra thing down. Note we don't fetch the error
1074 * stream...why not? Why?
1076 (void) dup2(fds[1], 1);
1077 (void) close(fds[1]);
1079 #if defined(DEFSHELL) && DEFSHELL == 0
1080 (void) execv("/bin/csh", args);
1082 (void) execv("/bin/sh", args);
1084 (void) execv("/bin/ksh", args);
1086 #error "DEFSHELL must be 1 or 2."
1092 *error = "Couldn't exec \"%s\"";
1097 * No need for the writing half
1099 (void) close(fds[1]);
1101 buf = Buf_Init (MAKE_BSIZE);
1104 char result[BUFSIZ];
1105 cc = read(fds[0], result, sizeof(result));
1107 Buf_AddBytes(buf, cc, (Byte *) result);
1109 while (cc > 0 || (cc == -1 && errno == EINTR));
1112 * Close the input side of the pipe.
1114 (void) close(fds[0]);
1117 * Wait for the process to exit.
1119 while(((pid = wait(&status)) != cpid) && (pid >= 0))
1123 *error = "Error reading shell's output for \"%s\"";
1125 res = (char *)Buf_GetAll (buf, &cc);
1126 Buf_Destroy (buf, FALSE);
1129 *error = "\"%s\" returned non-zero status";
1132 * Null-terminate the result, convert newlines to spaces and
1133 * install it in the variable.
1140 * A final newline is just stripped
1161 * exit with usage message
1166 (void)fprintf(stderr, "%s\n%s\n%s\n",
1167 "usage: make [-BPSXeiknqrstv] [-C directory] [-D variable] [-d flags]",
1168 " [-E variable] [-f makefile] [-I directory] [-j max_jobs]",
1169 " [-m directory] [-V variable] [variable=value] [target ...]");